feat(ui): human-confirmed status suggestion banner

When a job workspace opens, loads /status-suggestion and shows a
dismissible banner when a recent inbound email implies a status move
("This email looks like a move to Interview"). Applying it PATCHes the
status; nothing changes without the user's click.

- StatusSuggestion type + load-on-open effect + apply handler
- warning-toned banner shown above tab content on any tab
- EN/NB translations; README endpoint docs
- 2 frontend tests; full suite green (21 suites / 48 tests)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -205,6 +205,8 @@ Authentication:
   - Returns totals, counts by status, applied-last-30-days, and average days since applied.
 - `GET /api/jobapplications/{id}/match-score`
   - Deterministic CV↔job keyword-coverage score (0–100) with matched/missing keywords and per-CV-section coverage. No AI calls: results are instant and reproducible. Requires profile CV text/structure and a job description. (The AI narrative equivalent is `GET /api/jobapplications/{id}/candidate-fit`.)
+- `GET /api/jobapplications/{id}/status-suggestion`
+  - Deterministic status suggestion derived from the job's most recent inbound message (interview invite / offer / rejection). Returns a forward-only suggestion (`hasSuggestion`, `suggestedStatus`, `signal`, …) or `hasSuggestion: false`. Applying it is a normal `PATCH .../status` — always user-confirmed.
 - `DELETE /api/jobapplications/{id}`
   - Soft-deletes an application (`IsDeleted=true`); records a `Deleted` event.
 - `POST /api/jobapplications/{id}/restore`